A hybrid approach to reducing computed tomography metal artifacts in intracavitary brachytherapy

Dan Xia, John C. Roeske, Lifeng Yu, Charles A. Pelizzari, Arno J. Mundt, Xiaochuan Pan

Research output: Contribution to journalArticle

47 Scopus citations

Abstract

PURPOSE: To develop a hybrid approach to reduce computed tomography (CT) metal artifacts caused by the Fletcher-Suit applicator. METHODS AND MATERIALS: Using the acquired raw projection data, the hybrid algorithm determines the separate contributions from the metal and non-metal objects. Next, reconstructions of metal and non-metal images are separately obtained from their estimated projections. A final image is formed by appropriately combining the individual images. Phantom and patient data are used to evaluate the performance of this method. RESULTS: CT images reconstructed by use of the standard filtered-backprojection (FBP) algorithm contain significant artifacts even for small metal objects. However, images reconstructed using the hybrid algorithm contain virtually no artifacts. For metal objects with complex structures, the hybrid algorithm can also yield images containing fewer severe streak artifacts than those reconstructed using the FBP algorithm alone. CONCLUSIONS: These studies demonstrate that the hybrid approach can effectively reduce CT metal artifacts caused by the Fletcher-Suit applicator.

Original languageEnglish (US)
Pages (from-to)18-23
Number of pages6
JournalBrachytherapy
Volume4
Issue number1
DOIs
StatePublished - Jan 1 2005

Keywords

  • Brachytherapy
  • CT artifacts
  • Cervical cancer

ASJC Scopus subject areas

  • Oncology
  • Radiology Nuclear Medicine and imaging

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